The above equation is solved subject to the boundary condition
\(F^{\prime }(0)=0\) . The expression for estimating the minimum eigenvalue of
\(\lambda ^{2}\)  is provided by [1]}
\(\lambda ^2=\frac{\int _{0}^{1}dz\left[p(z)[F^{\prime }(z)]^2+zF^2(z)\right]}{\int _{0}^{1}dz q(z)[F(z)]^2},\) 
